// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/files/dir_reader_posix.h"

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "base/files/scoped_temp_dir.h"
#include "base/logging.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"

#if defined(OS_ANDROID)
#include "base/os_compat_android.h"
#endif

namespace base {

TEST(DirReaderPosixUnittest, Read)
{
    static const unsigned kNumFiles = 100;

    if (DirReaderPosix::IsFallback())
        return;

    base::ScopedTempDir temp_dir;
    ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
    const char* dir = temp_dir.path().value().c_str();
    ASSERT_TRUE(dir);

    const int prev_wd = open(".", O_RDONLY | O_DIRECTORY);
    DCHECK_GE(prev_wd, 0);

    PCHECK(chdir(dir) == 0);

    for (unsigned i = 0; i < kNumFiles; i++) {
        char buf[16];
        snprintf(buf, sizeof(buf), "%d", i);
        const int fd = open(buf, O_CREAT | O_RDONLY | O_EXCL, 0600);
        PCHECK(fd >= 0);
        PCHECK(close(fd) == 0);
    }

    std::set<unsigned> seen;

    DirReaderPosix reader(dir);
    EXPECT_TRUE(reader.IsValid());

    if (!reader.IsValid())
        return;

    bool seen_dot = false, seen_dotdot = false;

    for (; reader.Next();) {
        if (strcmp(reader.name(), ".") == 0) {
            seen_dot = true;
            continue;
        }
        if (strcmp(reader.name(), "..") == 0) {
            seen_dotdot = true;
            continue;
        }

        SCOPED_TRACE(testing::Message() << "reader.name(): " << reader.name());

        char* endptr;
        const unsigned long value = strtoul(reader.name(), &endptr, 10);

        EXPECT_FALSE(*endptr);
        EXPECT_LT(value, kNumFiles);
        EXPECT_EQ(0u, seen.count(value));
        seen.insert(value);
    }

    for (unsigned i = 0; i < kNumFiles; i++) {
        char buf[16];
        snprintf(buf, sizeof(buf), "%d", i);
        PCHECK(unlink(buf) == 0);
    }

    PCHECK(rmdir(dir) == 0);

    PCHECK(fchdir(prev_wd) == 0);
    PCHECK(close(prev_wd) == 0);

    EXPECT_TRUE(seen_dot);
    EXPECT_TRUE(seen_dotdot);
    EXPECT_EQ(kNumFiles, seen.size());
}

} // namespace base
